Pensions and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2017

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Net Periodic Benefit Cost

The net periodic pension and other postretirement benefit costs for the three months ended March 31, 2017 and 2016 were as follows:

	Pension						Other Postretirement Benefit
	Three Months Ended March 31						Three Months Ended March 31
($ in millions)	2017			2016			2017			2016
Service cost	$	9		$	13		$	2		$	4
Interest cost	24			42			7			10
Expected return on plan assets	(34		)	(67		)	—			—
Amortization of actuarial losses	19			30			5			4
Amortization of prior service credit	—			—			(13		)	(2		)
Pension settlement charge	22			—			—			—
Net periodic benefit cost	$	40		$	18		$	1		$	16

Defined Contribution Plan Disclosures

	Three Months Ended March 31
($ in millions)	2017		2016
U.S. defined benefit pension contributions	$	29	$	—
Non-U.S. defined benefit pension voluntary contributions	$	—	$	6
Non-U.S. defined benefit pension mandatory contributions	$	5	$	—